Most categories translate their winning App Store ad into their biggest markets. Microlearning is the one where the winner stays in English. The longest-running ad in the whole category runs in Italy and Portugal without a word of Italian or Portuguese in it, and the app that translated the hardest, into five languages, switched the entire set off in June. Apple's public Ad Repository, the transparency dataset the EU Digital Services Act requires, shows the language and country of every App Store ad. We read the microlearning advertisers through it. Data window ends 21 July 2026.
The category's longest survivor is untranslated English
Deepstash runs one English line, "Bite-sized Knowledge & Books," across 8 EU countries, and Apple marks it over a year old and still recorded on 20 July 2026. Look at the countries: Belgium, Denmark, Estonia, Finland, Italy, Luxembourg, Portugal, Sweden. Italy and Portugal are not English-speaking markets, and Deepstash ran the English line there anyway, for more than a year, without translating it. Sumizeit does the same, "Microlearning & Books" in English across 11 countries at 248 days. Imprint ran "Learn and grow daily" in English across 10 countries for 230 days before stopping in June.
This works here for a reason specific to the category. The buyer is someone who wants to read more, absorb summaries, learn on a commute. That audience skews English-comfortable across Europe, so an English hook converts in storefronts where a fitness or dating app would need the local language. Translation is optional in microlearning in a way it is not in most categories, and the longevity data says the untranslated English line is the category's best-proven ad, not a fallback.
The heaviest translator switched its whole set off
Wiser is the counter-example. It ran "Micro Learning & Audio Books" and cloned it into five languages: German ("Micro-Learning & Hörbücher"), Dutch ("Microlearning & audioboeken"), Portuguese ("Microformação e Audiolivros"), Swedish ("Mikrolärande och ljudböcker"), and English. The translation discipline is textbook, same concept, one language each, no repositioning. And on 22 June 2026 the whole set stopped. Its year-plus English-and-multilingual survivor and its per-language clones were all last recorded within days of each other in late June.
So breadth of localization and durability are two different things again. Wiser localized the widest and holds none of it live now. Deepstash localized nothing and holds the longest. If you are learning from a rival, count languages to see where it thinks demand is, but read longevity to see which approach actually paid.
When these apps do localize, repositioning beats translation
Two apps localize and keep their translated lines alive, and both change the message, not the wording.
Blinkist runs English "Learn something new every day" across 12 countries, then a German "Neues Wissen für jeden Tag" (new knowledge every day) and a Dutch "Leer elke dag iets nieuws" (learn something new every day), all still live. The German is not a literal echo of the English; it leads with knowledge rather than the act of learning.
Headway goes further. Its German line is "Hörbücher & Allgemeinbildung" (audiobooks and general knowledge), and it is Headway's single longest survivor at 309 days. In German-speaking markets Headway does not sell "book summaries" at all. It sells audiobooks and the payoff of general knowledge. Its French line is a memory hook, "Listen, Read, Remember, Repeat," 136 days and still live. Different lead per market, each proven on its own clock. The localized lines that survive in this category are the ones written for the market, not translated at it.
What a founder should do
If your product is a knowledge or reading tool, test the cheap path first: one English line across every EU storefront, untranslated, and let longevity tell you whether it holds. In microlearning it often will, because the audience reads English. Deepstash has run a year on exactly that. Only translate once the English line is clearly working and a specific market is worth the cost, and when you do, reposition rather than echo: Headway's German audiobook line outlives every verbatim clone in the category. And watch for a rival killing a translated set the way Wiser did in June, because that is the market telling you the translation was not worth what it cost.
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Method note: figures are computed from Apple's public Ad Repository (DSA Article 39), across 25 EU storefronts, data window ending 21 July 2026. Country counts are the distinct storefronts a creative ran in; language is the ad's declared default language tag. Translations shown are literal glosses of the advertisers' own lines, for readers who do not speak them. Longevity is a proxy for performance, not a measured conversion rate. We invented no numbers beyond what the repository reports. Refreshed monthly.